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Evidence for your next connection.

Independent measurements of remote MCP servers. Every observation has a timestamp.

Read-only probes

MCP server · Payments & trading

NPI Who

US health care providers by NPI, name or phone, with payments, Medicare, OIG and facility data.

Checks passed
13 / 22

2 failed · 7 not measured

Median response
797 ms

Median of successful probes over 7 days

30-day uptime
Not measured

Share of countable probes over 30 days, including daily rollups. Auth challenges are excluded.

Discovered tools
6

Tool definitions returned by this server

Independent monitoring

Health & checks

Status history

Responded

The server completed its last measured handshake. This is an observation, not a guarantee.

Last checked
Check summary by test group
Test areaPassedFailedUnmeasured
ConnectionCan a client connect and discover tools?
500
Reliability & speedDoes it respond consistently and quickly?
103
Access & authenticationWhat is required to use this server?
102
Tool qualityAre the tool definitions usable by an agent?
220
Publisher identityCan the publisher be traced to its source?
402

Unmeasured means there is not enough evidence to decide. How these checks work

Inspect individual checks 22 recorded

Core

  • Pass
    Reachable

    Latest probe returned HTTP 200 in 867 ms.

  • Pass
    Valid handshake

    protocolVersion 2025-11-25, serverInfo.name npiwho.

  • Pass
    Lists tools

    tools/list returned 6 tools.

  • Pass
    Current protocol

    Negotiated 2025-11-25. The bar is 2025-06-18 or newer.

  • Pass
    HTTPS

    The endpoint URL is https.

Performance

  • Not measured
    Fast (p50)

    Median latency 797 ms over 2 samples in 7 days. The bar is 1000 ms. Need at least 5 samples.

  • Not measured
    Consistent (p95)

    95th percentile 860 ms over 2 samples in 7 days. The bar is 3000 ms. Need at least 20 samples.

  • Not measured
    Reliable (uptime)

    2 of 2 attempts returned a tool list in 30 days (100%). The bar is 99%. Need at least 30 samples.

  • Pass
    Stable tool list

    No tool was removed and no required parameter was added in the last 30 days.

Access

  • Pass
    Open access

    tools/list succeeded with no credential, and the record declares none.

  • Not measured
    Standard auth

    Auth is not required, so the OAuth metadata check does not apply.

  • Not measured
    Free tier cited

    No publisher quote has been checked.

Tools

  • Pass
    Tools described

    Every tool description is at least 20 characters.

  • Pass
    Valid input schemas

    Every inputSchema is a JSON Schema object.

  • Fail
    Parameters documented

    8 of 13 parameters have a description (62%). The bar is 80%.

  • Fail
    Safety hints

    6 tools set neither readOnlyHint nor destructiveHint.

Publisher

  • Pass
    Verified namespace

    Listed in the Official MCP Registry.

  • Not measured
    Website matches publisher

    This namespace is not a reverse domain, so the website comparison does not apply.

  • Pass
    Source repo linked

    A repository URL is on file.

  • Pass
    Repo owner matches

    The GitHub repository owner matches the namespace login.

  • Pass
    Recently updated

    Updated 2026-10-25T13:14:01.659791Z, within 180 days.

  • Not measured
    Open-source licence

    The GitHub licence lookup has not returned an OSI result yet.

Start using NPI Who

Connect to this server

Choose your client, copy the configuration, then enable the server in your client’s MCP settings.

Run this command in your terminal, then restart Claude Code.

Claude Code

claude mcp add --transport http npi-who https://npiwho.com/mcp

Capabilities

Tools 6

data_sources

Use when asked how current or how reliable the data is, or what it does not include. Which public files this data comes from, their snapshot dates, and what they do not cover.

Discovered
list_facilities

Use when the question is about facilities of a kind in a state or city rather than one named provider. Medicare-certified home health agencies, hospices, hospitals, nursing homes, or HRSA health centers (FQHCs) in a state, optionally one city. Up to 50 rows with page urls; the full list and a CSV are at the state page url.

Discovered
lookup_phone

Use when the question is who a phone number belongs to. Providers whose registry practice phone, or a phone they published on a claimed page, is this number. Any US format. Providers who asked for their phone to be withheld are not returned.

Discovered
lookup_provider

Use when the question names an NPI, or after search_providers has found the right person. One provider by NPI: the registry record, and what the public files have on them (Open Payments total, Medicare billing, OIG exclusion, Medicare clinician record, facility enrollments, claimed-page details) with the page section where each is. The result's url is the page to cite and to send readers to for the detail.

Discovered
nearby_providers

Use when the question is who else does this nearby, or for alternatives to a provider. The providers with the same specialty nearest a given provider (by NPI) or a ZIP code and specialty, by distance between ZIP code centres. Up to 12.

Discovered
search_providers

Use when the question names a person or practice but no NPI. Find individual providers or organizations by name, optionally within a state. Returns up to 20 matches, best first, each with its page url. Use lookup_provider on a result for the full record.

Discovered

Recent measurements

Probe history

View status
Latest stored probes. Raw probe rows are kept for 14 days.
CheckedResultResponseTools
Connected867 ms6
Connected727 ms6